After four days of continues earthquake activity it appears that
Krísuvík volcano has stepped up it’s activity by a order
of magnitude. Since midnight there have been over 400 earthquakes in
Krísuvík volcano. The activity is continuing when this is
written and does not show any signs of slowing down at this moment.
Geologist in Iceland are expecting more earthquakes in this area over
the next hours and even earthquakes that are larger then ML3.0 in size.

The largest earthquakes where ML3.3 and ML3.7 in size. This is
automatic size by the SIL system. The depth of the earthquakes was 4.7
km and 1.1 km according to the automatic SIL system. Due to high number
of earthquakes the SIL system is putting earthquakes down all around
the Reykjanes Peninsula. While there might be some earthquakes there,
the number is not nearly as high as can be seen on the map. The
earthquakes can be located by there low quality number.

Given the location and how this earthquake swarm is behaving it is my
opinion that this is due to a magma is pushing up the crust in this
area. But it remains a question of this is going to start a eruption or
not. But the chances are growing for as long as this earthquake pattern
holds up in Krísuvík volcano. If a eruption starts in
Krísuvík volcano it is going to one of Hawaii type
eruption, unless it is under water then it is going to be explosive for
as long there is water getting into the crater. Last time there was a
eruption in this area a 25 km long eruption fissure did form.

For now however all that can be done is to wait and see what happens.
This earthquake swarm is going to continue for the next few hours and
even days. The largest earthquakes can be seen on my geophone sensors
here. - Posted on February 27, 2011 by Jón Frímann